i changed the hinge of the sony wh1000xm4 to fit the mdr1000x. the model shown is for the (R)ight earcup. 

see the two squares on each side. these should be cut off if you're using standard headphone slidy part thingies :P

i think it works pretty good. used a .4 instead of .2 because I only have a .4. standard pla. has tree supports